Note: We never use "do/does" before the verb "to be" or before modal verbs in questions. Instead, we invert the subject and verb:

Are you coming to my party?

Was the film good?

Weren't you hungry?

2. Questions with Inversion

With certain verbs ("to be", "to do", "to have", and modal verbs) questions are formed by inverting the subject and object.

Is Paolo busy? (Inversion of the statement 'Paolo is busy)

Have you seen this film? (Inversion of the statement 'You have seen this film)

Would you like to go to the cinema? (Inversion of the statement 'You would like to go to the cinema)

Will they be here soon?

Can I read this book?

Won't you stop talking?

3. Questions with question tags:

In spoken English, a question tag can be used after a statement, using the verb 'To Be', an auxiliary or modal verb, to form an add-on question. The question tag asks the listener to confirm the statement that it follows. If the statement does not use the verb 'to be' or a modal verb, we use 'Do' in the question tag. The question tag is usually an inversion of the subject and verb, repeated at the end of the sentence.